Central Weather Bureau Temperature Data

library(rjson)
library(dplyr)
library(ggplot2)
library(readxl)
library(patchwork)

large <- theme(legend.title = element_text(size=15),
        legend.text = element_text(size=15),
        axis.title = element_text(size=15),
        axis.text = element_text(size=15),
        strip.text = element_text(size=15))

rotate <- theme(axis.text.x = element_text(angle = 90, hjust=1))

no_strip <- theme(strip.background = element_rect(colour=NA, fill=NA),
                  strip.text = element_text(colour=NA))

Central Weather Bureau Buoy Data

海溫統計-臺灣海域各地海溫觀測月統計

cwb <-  fromJSON(file="../Data/C-B0050-001.json")

# Meta data 
meta <- lapply(cwb$cwbdata$Resources$Resource$Data$SeaSurfaceObs$Location, FUN=function(x)x[[1]])

# Monthly temperature
dat <- lapply(cwb$cwbdata$Resources$Resource$Data$SeaSurfaceObs$Location, FUN=function(x)x[[2]]$Monthly)

MonthlyTemperatureFun <- function(i){
  cbind(StationNameEN = lapply(meta, FUN=function(x)x$StationNameEN)[i] %>% as.character %>% as.factor,
        cbind(
          StationLatitude=lapply(meta, FUN=function(x)x$StationLatitude)[i] %>% as.numeric,
          StationLongitude=lapply(meta, FUN=function(x)x$StationLongitude)[i] %>% as.numeric,
          DataMonth=lapply(dat[[i]], FUN=function(x)x$DataMonth) %>% unlist %>% as.numeric,
          Maximum=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$Maximum) %>% unlist %>% as.numeric,
          MaximumYear=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$MaximumYear) %>% unlist %>% as.numeric,
          Mean=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$Mean) %>% unlist %>% as.numeric,
          Minimum=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$Minimum) %>% unlist %>% as.numeric,
          MinimumYear=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$MinimumYear) %>% unlist %>% as.numeric,
          MinimumAnomaly=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$MinimumAnomaly) %>% unlist %>% as.numeric,
          MaximumAnomaly=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$MaximumAnomaly) %>% unlist %>% as.numeric,
          MeanAnomaly=lapply(dat[[i]], FUN=function(x)x$SeaTemperature$MeanAnomaly) %>% unlist %>% as.numeric
          ) %>% as.data.frame
  )
}


hb <- MonthlyTemperatureFun(18) %>% subset(MinimumYear ==  MaximumYear)
hb$grp <- "hb"

cg <- MonthlyTemperatureFun(8) %>% subset(MinimumYear ==  MaximumYear)
cg$grp <- "cg"

tb <- MonthlyTemperatureFun(34) %>% subset(MinimumYear ==  MaximumYear)
tb$grp <- "tb3"
tb$grp[1:43] <- "tb1"
tb$grp[44:68] <- "tb2"

out <- rbind(hb, cg, tb) 
out$Time <- as.POSIXct(paste(out$MaximumYear, substr(as.character(out$DataMonth+1000), 3, 4), "15", sep="-"))
out$Lab <- factor(out$StationNameEN, levels=c("Hualien Buoy", "Chenggong", "Taitung Buoy"), labels=c("Hualien Buoy (A)", "Chenggong Buoy (B)", "Taitung Buoy (C)"))

p1 <- ggplot(data=out,aes(x=Time, y=Mean, ymin=Minimum, ymax=Maximum, group=grp, colour=Lab, fill=Lab))+
  geom_path()+
  geom_point()+
  #geom_ribbon(alpha=0.1, colour="transparent")+
  geom_vline(xintercept = as.POSIXct(c("2012-04-15", "2012-08-15")), colour="red", linetype=2)+
  scale_x_continuous(breaks=as.POSIXct(paste(2003:2023, "01", "01", sep="-")), labels=2003:2023)+
  scale_color_viridis_d()+
  scale_fill_viridis_d()+
  #facet_wrap(~Lab, ncol=1)+
  labs(x="Month", y=expression(Monthly~mean~temperature~(degree~C)), colour="Buoy", fill="Buoy", title="a")+
  xlim(as.POSIXct(paste(2011, "06", "01", sep="-")), as.POSIXct(paste(2013, "07", "31", sep="-")))+
  theme_bw()  %+replace% large %+replace% theme(axis.text.x = element_blank(), axis.title.x = element_blank())

p2 <- ggplot(data=out,aes(x=Time, y=Mean, ymin=Minimum, ymax=Maximum, group=grp, colour=Lab, fill=Lab))+
  geom_path()+
  geom_point()+
  geom_ribbon(alpha=0.1, colour="transparent")+
  geom_vline(xintercept = as.POSIXct(c("2012-04-15", "2012-08-15")), colour="red", linetype=2)+
  scale_x_continuous(breaks=as.POSIXct(paste(2003:2023, "01", "01", sep="-")), labels=2003:2023)+
  scale_color_viridis_d()+
  scale_fill_viridis_d()+
  facet_wrap(~Lab, ncol=1)+
  labs(x="Month", y=expression(Monthly~mean~temperature~(degree~C)), colour="Buoy", fill="Buoy", title="b")+
  xlim(as.POSIXct(paste(2011, "06", "01", sep="-")), as.POSIXct(paste(2013, "07", "31", sep="-")))+
  theme_bw()  %+replace% large %+replace% no_strip

p1/p2+plot_layout(nrow = 2, heights = c(1, 3))